Gas-supply system and method

ABSTRACT

A gas-supply system includes a gas container filled with gas, a gas flow controller coupled to the gas container via a first tube, and an operation device electrically connected to the gas flow controller. The gas-supply system further includes a pressure transducer installed on a second tube connected to the gas flow controller and configured to generate a pressure signal to the operation device according to the pressure of the gas in the second tube. The operation device is configured to generate a control signal to the gas flow controller according the pressure signal, and the gas flow controller is configured to adjust the flow rate of the gas in the second tube according to the control signal.

PRIORITY CLAIM AND CROSS-REFERENCE

The present application is a continuation-in-part of and claims priority from U.S. patent application Ser. No. 14/203,788, filed Mar. 11, 2014, which claims the benefit of U.S. Provisional Application No. 61/918,496, filed Dec. 19, 2013, the entireties of which are incorporated by reference herein.

BACKGROUND

Semiconductor devices are used in a variety of electronic applications, such as personal computers, cell phones, digital cameras, and other electronic apparatuses. Semiconductor devices are fabricated by various semiconductor processes. However, since semiconductor devices with smaller size and greater performance are in constant demand, some semiconductor processes are improved and modified.

In an epitaxy process of semiconductor manufacturing, a high-pressure liquefied gas, such as HCl and Cl₂, is utilized. Usually, the high-pressure liquefied gas is transmitted to the epitaxy apparatus at a very high pressure, to satisfy the flow rate and pressure requested by the epitaxy apparatus.

In another epitaxy process, a low-pressure liquefied gas is utilized. Due to the characteristics of the low-pressure liquefied gas, the gas cannot be transmitted at a high pressure, and may not satisfy the flow rate and pressure used by the epitaxy apparatus.

BRIEF DESCRIPTION OF THE DRAWINGS

Aspects of the present disclosure are best understood from the following detailed description when read with the accompanying figures. It should be noted that, in accordance with the standard practice in the industry, various features are not drawn to scale. In fact, the dimensions of the various features may be arbitrarily increased or reduced for clarity of discussion.

FIG. 1 is a schematic view of a gas-supply system and a semiconductor apparatus in accordance with some embodiments of the disclosure.

FIG. 2 is a diagram of flow rate versus delivery pressure of the semiconductor apparatus as shown in FIG. 1 in accordance with some embodiments of the disclosure.

FIG. 3 is a schematic view of a gas-supply system in accordance with some embodiments of the disclosure.

FIG. 4 is a schematic view of a gas flow controller or MFC (mass flow controller) in accordance with some embodiments of the disclosure.

FIG. 5 is a flow chart of a gas-supply method in accordance with some embodiments of the disclosure.

FIG. 6 is a schematic view of a gas-supply system in accordance with some embodiments of the disclosure.

FIG. 7A is a schematic view of a gas flow controller in accordance with some embodiments of the disclosure.

FIG. 7B is a schematic view of a gas flow controller in accordance with some embodiments of the disclosure.

FIG. 7C is a schematic view of a gas flow controller in accordance with some embodiments of the disclosure.

FIG. 8 is a flow chart of a gas-supply method of the gas-supply system 1 as shown in FIG. 6 in accordance with some embodiments of the disclosure.

FIG. 9 is a diagram of flow rate versus delivery pressure of the semiconductor apparatus in accordance with some embodiments of the disclosure.

DETAILED DESCRIPTION

The following disclosure provides many different embodiments, or examples, for implementing different features of the provided subject matter. Specific examples of components and arrangements are described below to simplify the present disclosure. These are, of course, merely examples and are not intended to be limiting. For example, the formation of a first feature over or on a second feature in the description that follows may include embodiments in which the first and second features are formed in direct contact, and may also include embodiments in which additional features may be formed between the first and second features, such that the first and second features may not be in direct contact. In addition, the present disclosure may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed.

Further, spatially relative terms, such as “beneath,” “below,” “lower,” “above,” “upper” and the like, may be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. The spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. The apparatus may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein may likewise be interpreted accordingly.

Some variations of the embodiments are described. Throughout the various views and illustrative embodiments, like reference numbers are used to designate like elements. It is understood that additional operations can be provided before, during, and after the method, and some of the operations described can be replaced or eliminated for other embodiments of the method.

FIG. 1 is a schematic view of a gas-supply system 1 a and a semiconductor apparatus 2 in accordance with some embodiments of the disclosure. The gas-supply system 1 a supplies gas to a semiconductor apparatus 2.

The gas-supply system 1 a includes gas containers 10 and gas regulators 20 a. The gas containers 10 are filled with gas. The gas containers 10 communicate with the semiconductor apparatus 2 via a tube T1, and supply the gas to the semiconductor apparatus 2 via the tube T1. The gas regulators 20 a are disposed on the tube T1. In some embodiments, a number of the valves E1 are disposed on the tube T1. Each of the gas containers 10 is selectively to supply the gas to the semiconductor apparatus 2 via the valves E1. For example, when one of the gas containers 10 is empty, the valve E1 connected to the empty gas container 10 is switched off, and another valve E1 connected to another gas container 10 having the gas is switched on. Furthermore, the gas is continuously supplied to the semiconductor apparatus 2 from the gas container 10 having the gas, and the empty gas container 10 can be replaced by a new gas container.

In some embodiments, the gas containers 10 are high-pressure gas cylinders. The pressure in the gas containers 10 is in a range from about 500 PSIG (Pounds per Square Inch Gauge) to about 2500 PSIG. For example, the pressure in the gas containers 10 is detected by a pressure sensor (not shown), and is about 2000 PSIG. In some embodiments, the gas is a high-pressure liquefied gas, such as CF₄, N₂O, Cl₂, NH3, HCl, CO₂, HBr, or SF₆. Further, the high-pressure liquefied gas is not liquefied in a low-pressure environment, such as lower than about 100 PSIG. Therefore, the high-pressure liquefied gas released from the gas containers 10 is not liquefied in the tube T1, or in the downstream of the gas regulators 20 a.

In some embodiments, the semiconductor apparatus 2 is an epitaxy apparatus. When the semiconductor apparatus 2 consumes the gas, the gas flows into the semiconductor apparatus 2 from the gas containers 10 due to the pressure in the gas containers 10. The gas regulators 20 a can be adjusted manually to control a delivery pressure in the tube T1.

FIG. 2 is a diagram of flow rate versus delivery pressure of the semiconductor apparatus 2 in FIG. 1 in accordance with some embodiments of the disclosure. The working pressure of the high-pressure liquefied gas utilized by the semiconductor apparatus 2 is in a range of from about 60 PSIG to about 70 PSIG. The flow rate of the gas utilized by the semiconductor apparatus 2 is from about 5 SLPM (Stand Liter per Minute) to about 100 SLPM. Referring to the curve C1, as shown in FIG. 2, the delivery pressure of the high-pressure liquefied gas in the semiconductor apparatus 2 is within a range of from about 60 PSIG to about 70 PSIG. Therefore, the semiconductor apparatus 2 works fine with the high-pressure liquefied gas.

However, in another epitaxy process, the gas is replaced by a low-pressure liquefied gas, and the gas containers 10 are lower-pressure gas cylinders for containing the low-pressure liquefied gas. For example, the working pressure of the gas utilized by the semiconductor apparatus 2 is in a range of from about 5 PSIG to about 7 PSIG, and the flow rate of the gas utilized by the semiconductor apparatus 2 is from about 5 SLPM (Stand Liter per Minute) to about 100 SLPM.

The low-pressure liquefied gas includes ClF₃, BCl₃, SiH₂Cl₂ (Dichlorosilane, DCS), C₄F₆, C₅F₈, HF or WF₆. The low-pressure liquefied gas may be liquefied if the gas pressure exceeds a saturation vapor pressure at gas room temperature. The gas room temperature is in a range from about 20° C. to about 25° C. The low-pressure liquefied gas may be liquefied in a range from about 30 PSIG to about 100 PSIG. Therefore, the pressure in the tube T1 is in a range from about −5 PSIG to about 15 PSIG at the gas room temperature to prevent the low-pressure liquefied gas from being liquefied.

Referring to the curve C2, as shown in FIG. 2, when the flow rate of the low-pressure liquefied gas in the tube T1 is increased from about 0 SLPM to about 4 SLPM, the delivery pressure of the low-pressure liquefied gas in the semiconductor apparatus 2 is quickly decreased from about 6 PSIG to about 0 PSIG. The reason for this situation is that the gas regulator 20 a has a high flow resistance. The flow resistance of the gas regulator 20 a is a result of the gas flowing through a poppet and a diaphragm (not shown) in the gas regulator 20 a. Due to flow resistance, the additional flow rate of the gas in the gas regulator 20 a induces additional delivery pressure drop.

In some embodiments, if the delivery pressure is lower than a predetermined working pressure of the semiconductor apparatus 2 at a corresponding flow rate, such as at least 5 SLPM, of the low-pressure liquefied gas, the semiconductor apparatus 2 stops working.

FIG. 3 is a schematic view of a gas-supply system 1 in accordance with some embodiments of the disclosure. The gas-supply system 1 includes gas containers 10, gas flow controllers 20, a buffer tank 30, a pressure transducer 40, and an operation device 50. The gas is transmitted from the gas containers 10, under the gas flow controllers 20, and via the buffer tank 30 to the semiconductor apparatus 2.

In some embodiments, the gas container 10 is a low-pressure liquefied gas cylinder. The pressure in the gas container 10 is in a range from about −10 PSIG to about 15 PSIG at the gas room temperature. The gas containers 10 are filled with gas and liquid, and the liquid naturally vaporizes to the gas at the gas room temperature. The gas is the low-pressure liquefied gas, such as DCS.

The gas flow controllers 20 are coupled to the gas containers 10. The gas flow controllers 20 are a mass-flow controller configured to measure and control the flow rate of the gas flowing into the buffer tank 30. The gas flow controllers 20 each adjust the flow rate of the gas to the buffer tank 30. The buffer tank 30 is configured to provide a stable pressure of the gas to the semiconductor apparatus 2. The buffer tank 30 is coupled to the gas flow controllers 20 and receives the gas from the gas container 10 via the gas flow controllers 20. The semiconductor apparatus 2 is coupled to the buffer tank 30 and receives the gas from the buffer tank 30.

In some embodiments, the gas flow controllers 20 are coupled with the gas containers 10 via a tube T2. The buffer tank 30 is coupled with the gas flow controllers 20 via a tube T3. The buffer tank 30 receives the gas from the gas container 10 via the tube T2, the gas flow controller 20, and the tube T3. The semiconductor apparatus 2 is communicated with buffer tank 30 with a tube T4 and receives the gas from the buffer tank 30 via the tube T4.

The pressure transducer 40 is disposed on the buffer tank 30. The pressure transducer 40 detects the pressure in the buffer tank 30 and generates a pressure signal S1 to the operation device 50 according to the pressure of the gas in the buffer tank 30.

The operation device 50 is electrically connected to the gas flow controllers 20 and the pressure transducer 40. In some embodiments, the operation device 50 is a computer. The operation device 50 generates a control signal S2 to the gas flow controllers 20 according to the pressure signal S1, and the gas flow controllers 20 adjust the flow rate of the gas according to the control signal S2.

In some embodiments, the gas-supply system 1 further includes heating devices 60. The heating device 60 heats the corresponding gas containers 10, and keeps the temperature of the gas in the gas container 10 in a range of from about 30° C. to about 45° C. For illustration, the temperature of the gas in the gas container 10 is detected by a thermometer (not shown), and is about 40° C. In some embodiments, the environment temperature is in a range of from about 20° C. to about 24° C., and the ignition temperature of the gas is a range of from about 52° C. to about 58° C. The environment temperature is defined as the temperature around the gas-supply system 1 and the semiconductor apparatus 2. In some embodiments, the environment temperature is about 22° C., and the ignition temperature of the gas is about 55° C.

When the temperature of the gas in the gas containers 10 increases, the pressure in the containers 10 increases. However, a higher temperature may cause the gas to ignite. In some embodiments, the temperature of the gas in the gas containers 10 is limited to being lower than the ignition temperature of the gas.

In some embodiments, the temperature of the gas in the buffer tank 30 is in a range from about 20° C. to about 25° C. For illustration, the temperature of the gas in the buffer tank 30 is detected by a thermometer (not shown) and is about 22° C., substantially equal to the environment temperature. In some embodiments, the pressure in the buffer tank 30 is in a range from about 5 PSIG to 7 PSIG. In such a condition, the gas may not be liquefied in the buffer tank 30 and in the tube T4.

FIG. 4 is a schematic view of a gas flow controller 20 in accordance with some embodiments of the disclosure. The gas flow controller 20 includes a housing 21, a first channel 22, a second channel 23, a flow-rate transducer 24, a control module 25, and a valve mechanism 26. The first channel 22, the second channel 23, the flow-rate transducer 24, the control module 25, and the valve mechanism 26 are disposed in the housing 21. The first channel 22 is coupled to the gas container 10 and the buffer tank 30, as shown in FIG. 3. In some embodiments, the first channel 22 is communicated with the tube T2 and T3.

The first channel 22 has a first section 221 and a second section 222. The cross-sectional area of the first section 221 is greater than the cross-sectional area of the second section 222. The cross-sectional area of the first section 221 is greater than the cross-sectional area of the second channel 23.

The two ends of the second channel 23 are connected to the first section 221 of the first channel 22. The flow-rate transducer 24 is disposed on the second channel 23. The flow-rate transducer 24 is configured to detect the flow rate of the gas in the second channel 23, and generate a measuring signal S3 according to the flow rate of the gas in the second channel 23. In some embodiments, the flow-rate transducer 24 includes a first temperature transducer 241 and a second temperature transducer 242. The first temperature transducer 241 and the second temperature transducer 242 are separated from each other and detect the temperature of the second channel 23 at different locations. When the gas flows in the first channel 22 and the second channel 23, the temperatures detected by the first temperature transducer 241 and the second temperature transducer 242 are different.

The control module 25 is electrically connected to the flow-rate transducer 24, the valve mechanism 26, and the operation device 50 (as shown in FIG. 3). The control module 25 is configured to receive the measuring signal S3.

In some embodiments, the flow rate of the gas can be calculated by the control module 25 according to the difference of the temperatures detected by the first temperature transducer 241 and the second temperature transducer 242. For example, when the gas flows in the first channel 22, the temperature detected by the temperature transducer 241 is about 22.03° C., and the temperature detected by the temperature transducer 242 is about 22.04° C. The difference of the temperatures of the temperature transducer 241 and the temperature transducer 242 is about 0.01° C., which corresponds to the flow rate of the gas.

In addition, when the first channel 22 is blocked by the valve mechanism 26, the gas does not flow through the second section 222 of the first channel 22. The temperatures detected by the first temperature transducer 241 and the second temperature transducer 242 are the same. Therefore, the control module 25 determines that the flow rate of the gas is zero due to the same temperatures being detected by the first temperature transducer 241 and the second temperature transducer 242.

The valve mechanism 26 is disposed on the second section 222 of the first channel 22. The valve mechanism 26 is controlled by the control module 25. The flow rate of the gas is adjusted according to the position of the valve mechanism 26 in the second section 222.

In some embodiments, the valve mechanism 26 includes a piezoelectric element 261. The volume of the piezoelectric element 261 changes according the applied voltage V1 on the piezoelectric element 261. The position of the valve mechanism 26 is adjusted according to the volume of the piezoelectric element 261. The control module 25 applies a corresponding voltage V1 to the piezoelectric element 261 according to the control signal S2, and the volume of the piezoelectric element 261 is adjusted by the voltage V1. For example, when the volume of the piezoelectric element 261 increases, the flow rate of the gas in the first channel 22 decreases.

FIG. 5 is a flow chart of a gas-supply method of the gas-supply system 1 as shown in FIG. 3 in accordance with some embodiments of the disclosure. In step S101, the gas-supply system 1 and the semiconductor apparatus 2 are provided. In the gas-supply system 1, the buffer tank 30 is coupled to the gas container 10 and the semiconductor apparatus 2. The semiconductor apparatus 2 receives the gas from the buffer tank 30.

In step S103, the pressure transducer 40 detects the pressure of the gas in the buffer tank 30, and generates a pressure signal S1 to the operation device 50. In step S105, the operation device 50 generates a control signal S2 according to a pressure signal S1 and a predetermined pressure value.

The operation device 50 controls the gas flow controller 20 to keep the pressure of the gas in the buffer tank 30 in a predetermined pressure range. For example, the predetermined pressure range is in a range of from about 5 PSIG to about 7 PSIG.

In some embodiments, the predetermined pressure value is set in the operation device 50, and the pressure signal S1 corresponding to the pressure in the buffer tank 30 includes an active pressure value. If the active pressure value is lower than the predetermined pressure value, the operation device 50 generates a control signal S2 to the gas flow controller 20 according to the difference between the active pressure value and the predetermined pressure value.

In step S107, the control module 25 of the gas flow controller 20 adjusts the flow rate of the gas flowing into the buffer tank 30 from the gas container 10 according to the control signal S2. In some embodiments, the flow-rate transducer 24 detects the flow rate of the gas flowing into the buffer tank 30 and generates a measuring signal S3 to the control module 25. The control module 25 of the gas flow controller 20 adjusts the flow rate of the gas flowing into the buffer tank 30 from the gas container 10 according to the control signal S2 and the measuring signal S3. After the gas flows into the buffer tank 30, the pressure in the buffer tank 30 gradually rises to the predetermined pressure range. In general, if the active pressure value is lower than the predetermined pressure value, the flow rate of the gas flowing into the buffer tank 30 increases.

If the pressure of the gas in the buffer tank 30 is in a predetermined pressure range, the operation device 50 continually fine-tunes the flow rate of the gas flowing into the buffer tank 30 to keep the pressure of the buffer tank 30 at about the predetermined pressure value. If the pressure of the gas in the buffer tank 30 is higher than the predetermined pressure range, the flow rate of the gas flowing into the buffer tank 30 is set to zero or substantially zero. Therefore, the gas flow controller 20 controls the valve mechanism 26 to close the second section 222 of the first channel 22 to block the gas flowing.

In step S109, the semiconductor apparatus 2 receives the gas from the buffer tank 30. When the semiconductor apparatus 2 consumes the gas, the gas flows from the buffer tank 30. In general, the semiconductor apparatus 2 does not continually consume the gas, and the quantity of the gas consumed by the semiconductor apparatus 2 depends on different semiconductor processes. As a result, the pressure in the buffer tank 30 is not constant. Therefore, by the gas-supply system 1 and the gas-supply method, the pressure in the buffer tank 30 can be kept in the predetermined pressure range.

Further, in some embodiments, the volume of the buffer tank 30 is at least two times greater than the volume of the gas container 10. Since the gas transmitted from the buffer tank 30 to the semiconductor apparatus 2 does not pass through any gas regulator, the flow resistance of the gas flowing to the semiconductor apparatus 2 is lower. Therefore, although the flow rate of the gas consumed by the semiconductor apparatus 2 changes, the delivery pressure and the flow rate of the gas applied to the semiconductor apparatus 2 satisfies the requirements of the semiconductor apparatus 2.

FIG. 6 is a schematic view of a gas-supply system 1 in accordance with some embodiments of the disclosure. The buffer tank 30 in FIG. 3 is excluded in FIG. 6. The gas is transmitted from the gas containers 10 to the semiconductor apparatus 2 via the gas flow controllers 20.

The gas flow controllers 20 are coupled to the gas containers 10 via the tubes T5. In some embodiments, each of the tubes T5 is connected to one of the gas flow controllers 20 and one of the gas containers 10. In some embodiments, each of the tubes T5 is connected to one of the gas flow controllers 20 and at least two gas containers 10.

The gas flow controllers 20 are configured to control the flow rate of the gas flowing into the semiconductor apparatus 2 via a tube T6. In some embodiments, the tube T6 is connected to the semiconductor apparatus 2 and the gas flow controllers 20. The semiconductor apparatus 2 is coupled to the gas flow controllers 20 via the tube T6 and is configured to receive the gas from the tube T6.

The pressure transducer 40 is installed on the tube T6. The pressure transducer 40 detects the pressure in the tube T6 and generates a pressure signal S1 to the operation device 50 according to the pressure of the gas in the tube T6.

The operation device 50 is electrically connected to the gas flow controllers 20 and the pressure transducer 40. The operation device 50 generates a control signal S2 to the gas flow controllers 20 according to the pressure signal S1, and the gas flow controllers 20 adjust the flow rate of the gas in the tube T6 according to the control signal S2.

FIG. 7A is a schematic view of a gas flow controller 20 in accordance with some embodiments of the disclosure. The gas flow controller 20 includes a housing 21 and a valve mechanism 26. The housing 21 is disposed on the tube T6. In some embodiments, the housing 21 covers a section T61 of the tube T6. The section T61 and the housing 21 are formed as a single piece.

The valve mechanism 26 is disposed in the housing 21. The position of the valve mechanism 26 in the section T61 of the tube T6 is according to the control signal. The flow rate of the gas in the tube T6 is adjusted according to the position of the valve mechanism 26 in the section T61 of the tube T6. The flow rate of the gas in the tube T6 is increased when the volume of the valve mechanism 26 in the section T61 is decreased. The flow rate of the gas in the tube T6 is decreased when the volume of the valve mechanism 26 in the section T61 is increased.

In some embodiments, the valve mechanism 26 is a proportional valve, such as an electric proportional valve. In some embodiments, the valve mechanism 26 includes a piezoelectric element 261. The position of the valve mechanism 26 is adjusted according to the volume of the piezoelectric element 261. The volume of the piezoelectric element 261 is adjusted according to the control signal S2. For example, when the volume of the piezoelectric element 261 increases, the flow rate of the gas in the tube T6 decreases.

FIG. 7B is a schematic view of a gas flow controller 20 in accordance with some embodiments of the disclosure. In some embodiments, the pressure transducer 40 is integrated into the gas flow controller 20. The pressure transducer 40 is disposed in the housing 21. The pressure transducer 40 contacts the gas in the tube T6 within the housing 21.

FIG. 7C is a schematic view of a gas flow controller 20 in accordance with some embodiments of the disclosure. In some embodiments, the valve mechanism 26 includes a core 262, a coil 263, and an elastic element 264. The core 262 is moveably disposed in the housing 21. The core 262 is made from a magnetic material.

The coil 263 is disposed in the housing 21, and around the core 262. When power is applied to the coil 263, the coil 263 generates a magnetic force to move the core 262 along a first direction D1. The magnetic force is changed according to the strength of the power. The strength of the power applied to the coil 263 is according to the control signal S2.

The elastic element 264 is disposed in the housing 21. The elastic element 264 is configured to apply an elastic force to move the core 262 along a second direction D2. In some embodiments, the second direction D2 is an inverse direction of the first direction D1.

The position of the core 262 is adjusted according to the magnetic force generated by the coil 263, and the strength of the magnetic force is according to the control signal S2. The flow rate of the gas in the tube T6 is adjusted according to the position of the core 262 in the section T61 of the tube T6.

FIG. 8 is a flow chart of a gas-supply method of the gas-supply system 1 as shown in FIG. 6 in accordance with some embodiments of the disclosure. In step S201, the gas-supply system 1 and the semiconductor apparatus 2 are provided. In the gas-supply system 1, the gas flow controllers 20 are coupled to the gas containers 10 via the tube T5, and coupled to the semiconductor apparatus 2 via the tube T6. The semiconductor apparatus 2 receives the gas from the tube T6.

In step S203, the pressure transducer 40 detects the pressure of the gas in the tube T6, and generates a pressure signal S1 to the operation device 50. In step S205, the operation device 50 generates a control signal S2 according to the pressure signal S1 and a predetermined pressure value.

In some embodiments, the predetermined pressure value is set in the operation device 50, and the pressure signal S1 corresponding to the pressure in the tube T6 includes an active pressure value. In some embodiments, when the active pressure value is lower than the predetermined pressure value, the operation device 50 generates a control signal S2 to the gas flow controller 20 according to the difference between the active pressure value and the predetermined pressure value. For example, the difference is greater, and the flow rate of the gas in the tube T6 is greater according to the control signal S2.

In step S107, the operation device 50 controls the gas flow controller 20 to keep the pressure of the gas in the tube T6 in a predetermined pressure range. The gas flow controller 20 adjusts the flow rate of the gas in the tube T6 according to the control signal S2. If the active pressure value is lower than the predetermined pressure value, the flow rate of the gas in the tube T6 is increased by the operation device 50. If the active pressure value is higher than the predetermined pressure value, the flow rate of the gas in the tube T6 is decreased by the operation device 50.

If the pressure of the gas in the tube T6 is in a predetermined pressure range, the operation device 50 continually fine-tunes the flow rate of the gas in the tube T6 to keep the pressure of the tube T6 at about the predetermined pressure value. If the pressure of the gas in the tube T6 is higher than the predetermined pressure range, the flow rate of the gas in the tube T6 is set to zero or substantially zero. In some embodiments, the gas flow controller 20 controls the valve mechanism 26 to block the gas in the section T61 flowing.

In step S209, the semiconductor apparatus 2 receives the gas from the tube T6.

FIG. 9 is a diagram of flow rate versus delivery pressure of the semiconductor apparatus 1 in accordance with some embodiments of the disclosure. The flow rate of the lower pressure liquefied gas utilized by the semiconductor apparatus 2 is from 10 SLPM to 100 SLPM. The working pressure of the gas utilized by the semiconductor apparatus 2 is in a range from about 5 PSIG to about 7 PSIG. Referring to the curve C3, as shown in FIG. 9, the delivery pressure of the low-pressure liquefied gas in the semiconductor apparatus 2 is within the working pressure. Therefore, the semiconductor apparatus 2 works fine with the low-pressure liquefied gas.

Some embodiments for a gas-supply system are provided. The gas-supply system keeps the pressure of a gas being transferred to semiconductor apparatus in a predetermined pressure range. Further, the flow rate and pressure of low-pressure liquefied gas utilized by the semiconductor apparatus is satisfied by the gas-supply system.

In some embodiments, a gas-supply system is provided. The gas-supply system includes a gas container filled with gas, a gas flow controller coupled to the gas container via a first tube, and an operation device electrically connected to the gas flow controller. The gas-supply system further includes a pressure transducer installed on a second tube connected to the gas flow controller and configured to generate a pressure signal to the operation device according to the pressure of the gas in the second tube. The operation device is configured to generate a control signal to the gas flow controller according to the pressure signal, and the gas flow controller is configured to adjust a flow rate of the gas in the second tube according to the control signal.

In some embodiments, a gas-supply system is provided. The gas-supply system includes a gas container filled with gas and a gas flow controller coupled with the gas container via a first tube. The gas is a low-pressure liquefied gas. The gas-supply system also includes a pressure transducer installed on a second tube connected to the gas flow controller and configured to generate a pressure signal according to a pressure of the gas in the second tube. The gas-supply system further includes an operation device receiving the pressure signal and configured to generate a control signal to the gas flow controller according the pressure signal and a predetermined pressure value. The gas flow controller is configured to adjust the flow rate of the gas in the second tube according to the control signal to keep the pressure of the gas in the in the second tube within a predetermined pressure range. The semiconductor apparatus is coupled to the gas flow controller via the second tube and is configured to receive the gas from the second tube.

In some embodiments, a gas-supply method is provided. The method includes providing a gas flow controller coupled to a gas container via a first tube and detecting pressure of a gas in a second tube coupled to the gas flow controller and generating a pressure signal. The method further includes generating a control signal according the pressure signal and a predetermined pressure value. The method further includes adjusting a flow rate of a gas flowing in the second tube via the gas flow controller according to the control signal, and receiving the gas from the second tube.

The foregoing outlines features of several embodiments so that those skilled in the art may better understand the aspects of the present disclosure. Those skilled in the art should appreciate that they may readily use the present disclosure as a basis for designing or modifying other processes and structures for carrying out the same purposes and/or achieving the same advantages of the embodiments introduced herein. Those skilled in the art should also realize that such equivalent constructions do not depart from the spirit and scope of the present disclosure, and that they may make various changes, substitutions, and alterations herein without departing from the spirit and scope of the present disclosure. 

What is claimed is:
 1. A gas-supply system, comprising: two gas containers filled with gas; a gas flow controller comprising: a channel coupled to the two gas containers via a tube; a valve mechanism disposed on the channel; and a control module electrically connected to the valve mechanism and configured to control the valve mechanism; an operation device electrically connected to the control module; a buffer tank coupled to the channel and to a semiconductor apparatus, wherein the buffer tank is configured to receive the gas from one of two gas containers via the channel of the gas flow controller; and a pressure transducer connected to the buffer tank via a gas line diverged from the buffer tank and configured to generate a pressure signal to the operation device according to the pressure of the gas in the buffer tank, wherein the operation device is configured to generate a control signal to the control module of the gas flow controller according to the pressure signal, and the control module is configured to adjust a flow rate of the gas flowing into the buffer tank according to the control signal.
 2. The gas-supply system as claimed in claim 1, wherein the valve mechanism comprises a piezoelectric element passing through an outer wall of the channel, a volume of the piezoelectric element is adjusted according to the control signal, and the position of the valve mechanism in the channel is adjusted according to the volume of the piezoelectric element.
 3. The gas-supply system as claimed in claim 1, wherein the valve mechanism comprises: a core passing through an outer wall of the channel; a coil, around the core, configured to generate a magnetic force to the core; and an elastic element configured to apply an elastic force to the core, wherein the magnetic force is adjusted according to the control signal, and the position of the core in the channel is adjusted according to the magnetic force.
 4. The gas-supply system as claimed in claim 1, wherein the gas comprises ClF₃, BCl₃, SiH₂Cl₂, C₄F₆, C₅F₈, HF or WF₆.
 5. The gas-supply system as claimed in claim 1, wherein the pressure in each of the two gas containers is in a range from about 9 PSIG to about 30 PSIG, and a temperature in each of the two gas containers is in a range from about 35° C. to about 45° C.
 6. The gas-supply system as claimed in claim 1, wherein the pressure in the buffer tank is in a range from about 5 PSIG to about 7 PSIG, and a temperature in the buffer tank is in a range from about 20° C. to about 25° C.
 7. The gas-supply system claimed in claim 1, wherein the channel extends along a first direction, and the gas flow controller comprises: a core: a coil around the core; and an elastic element connected to the core, wherein the core is movable along a second direction which is perpendicular to the first direction of the channel.
 8. The gas-supply system claimed in claim 7, wherein the elastic element is outside the channel.
 9. The gas-supply system claimed in claim 7, wherein the elastic element is not exposed to the gas in the channel.
 10. The gas-supply system claimed in claim 1, wherein the gas line is isolated from the semiconductor apparatus.
 11. A gas-supply system, comprising: two gas containers filled with gas, wherein the gas is a low-pressure liquefied gas; a gas flow controller comprising: a channel coupled to the two gas containers via a tube; a valve mechanism disposed on the channel; and a control module electrically connected to the valve mechanism and configured to control the valve mechanism; a buffer tank coupled to the channel and a semiconductor apparatus, wherein the buffer tank is configured to receive the gas from one of two gas containers via the channel of the gas flow controller; a pressure transducer connected to the buffer tank via a gas line diverged from the buffer tank and configured to generate a pressure signal according to the pressure of the gas in the buffer tank; and an operation device configured to receive the pressure signal and to generate a control signal to the control module of the gas flow controller according to the pressure signal and a predetermined pressure value, wherein the gas flow controller is configured to adjust the flow rate of the gas in the buffer tank according to the control signal to keep the pressure of the gas in the buffer tank within a predetermined pressure range.
 12. The gas-supply system as claimed in claim 11, wherein the valve mechanism comprises a piezoelectric element passing through an outer wall of the channel, a volume of the piezoelectric element is configured to be adjusted according to the control signal, and the position of the valve mechanism in the channel is configured to be adjusted according to the volume of the piezoelectric element.
 13. The gas-supply system as claimed in claim 11, wherein the valve mechanism comprises: a core passing through an outer wall of the channel; a coil, around the core, configured to generate a magnetic force to the core; and an elastic element configured to apply an elastic force to the core, wherein the magnetic force is adjusted according to the control signal, and the position of the core in the channel is adjusted according to the magnetic force.
 14. The gas-supply system as claimed in claim 11, wherein the gas comprises ClF₃, BCl₃, SiH₂Cl₂, C₄F₆, C₅F₈, HF or WF₆.
 15. The gas-supply system as claimed in claim 11, wherein the pressure in each of the two gas containers is in a range from about 9 PSIG to about 30 PSIG, and a temperature in each of the two gas containers is in a range from about 35° C. to about 45° C.
 16. The gas-supply system as claimed in claim 11, wherein the predetermined pressure range is from about 5 PSIG to about 7 PSIG, and a temperature in the buffer tank is in a range from about 20° C. to about 25° C.
 17. A gas-supply method, comprising: supplying gas from two gas containers to a channel of a gas flow controller via a tube guiding gas from the channel of the gas flow controller to a semiconductor apparatus via a buffer tank, wherein the gas flow controller comprises: a valve mechanism disposed on the channel; and a control module electrically connected to the valve mechanism and configured to control the valve mechanism; detecting pressure of gas in the buffer tank via a gas line diverged from the buffer tank and generating a pressure signal according to the detected pressure; generating a control signal according to the pressure signal and a predetermined pressure value and sending the control signal to the control module; and adjusting a flow rate of the gas flowing into the buffer tank via at least one of the valve mechanism of the gas flow controller according to the control signal.
 18. The gas-supply method as claimed in claim 17, further comprising adjusting the flow rate of the gas flowing into the buffer tank to keep the pressure of the gas in the buffer tank within a predetermined pressure range, wherein the predetermined pressure range is from about 5 PSIG to about 7 PSIG.
 19. The gas-supply method as claimed in claim 18, wherein when the pressure of gas in the buffer tank is in the predetermined pressure range, the flow rate of the gas flowing in the buffer tank is continuously adjusted to keep the pressure of the buffer tank at about the predetermined pressure value. 